PROVIDENCE — There was no debate last winter about what Rhode Island’s environmental groups wanted the General Assembly to do in its 2020 session. The Environment Council of Rhode Island had only one item on its list of legislative priorities — winning passage of a law that would finally make targets adopted years ago for reductions in greenhouse gas emissions mandatory and enforceable in the state. The Act on Climate bill — which aims for a 100% reduction in emissions by 2050 — had a hearing in the House last March but never progressed further before the rest of the session was canceled in the face of the coronavirus pandemic.